IPX/SPX Programming Manual

Glossary
HP NonStop IPX/SPX Programming Manual—528022-001
Glossary-14
SNAP
SNAP. (Subnetwork Access Protocol). In order to run the TCP/IP protocol suite over IEEE
networks, the Subnetwork Access Protocol (SNAP) defines the interface between the
IP layer and the LLC layer. The interface is accomplished by the use of an extension of
the LLC header that contains a predefined Service Access Point (SAP) for use in the
Source SAP (SSAP) and the Destination SAP (DSAP) fields of the LLC header.
socket. For Berkeley Software Distribution (BSD) software, an endpoint for communication
created by the socket or socket_nw2 function calls. Not to be confused with the Novell
socket number. See socket number.
socket number. For NonStop IPX/SPX, the unique port identifier of a network address,
node address, port identifier triple that comprises an IPX address. A BSD Internet port
is the equivalent of a NonStop IPX/SPX socket number.
SPI . (Subsystem Programmatic Interface) In DSM, a set of procedures and associated
definition files used to define common message-based programmatic interfaces for
communication between requesters and servers—for instance, in a management
application. SPI includes procedures to build and decode specially formatted
messages; definition files in Pascal, TAL, C, COBOL85, and TACL for inclusion in
programs, macros, and routines using the SPI procedures; and definition files in DDL
for programmers writing their own subsystems.
SPX. See Sequenced Packet Exchange (SPX and SPXII).
SPXII. See Sequenced Packet Exchange (SPX and SPXII).
SQL. See Structured Query Language (SQL).
SSID. See subsystem ID (SSID).
state. For DSM, the current condition of an object that indicates its readiness to do work.
See summary state.
Structured Query Language (SQL). A set of commands that allows users to inquire about
the contents of a database.
subject token. In event management, a device, process, or other named entity about
which a given event message has information.
subnet address. An extension of the Internet addressing scheme that allows a site to use a
single Internet address for multiple physical networks. Outside of the site using subnet
addressing, routing continues as usual by dividing the destination address into an
Internet portion and local portion. Gateways and hosts inside a site using subnet
addressing interpret the local portion of the address by dividing it into a physical
network portion and a host portion.
subnetwork. One or more intermediate systems that provide relaying and through which
end open systems might establish network connections. See also intermediate system
or end system.